Two-time Oscar winner Viven Leigh, the iconic Scarlett O’Hara in “Gone With The Wind,” was a hot mess off-screen — a slutty bisexual who battled mental illness for most of her adult life, an explosive new biography claims.

“Damn You, Scarlett O’Hara” outs at least three of Leigh’s lesbian lovers, and describes her insatiable appetite for “rough trade” — bad boys she’d pick up at Scotty’s, a notorious LA brothel that masqueraded as a gas station with one pump and 22 attendants, The Sunday Times of London reports.

“In the 1940s, the world’s most recognizable star would drive down to Scotty’s with her friend George Cukor, the initial director of ‘Gone With The Wind,’ and they would both pick out young men for the night,” a publishing source told the newspaper.

“They would pay the men with gifts such as cigarette cases, jewels, or even stocks and bonds. She depended on the professional discretion of men not to boast they had just serviced Scarlett O’Hara.”

In the glitzy, glamorous Hollywood of the 1930s, Leigh was seen as the romantic soul mate of another rising star, Laurence Olivier, who left his lesbian wife for her.

But unpublished memoirs and witness accounts suggest that within months of becoming lovers in 1937, they were both “playing away from home,” claim co-authors Darwin Porter, who knew the actress in the ’60s, and Roy Moseley, who was Olivier’s personal assistant.

In addition to an affair with Brit actress Isabel Jeans and at least two other women, the book claims Leigh slept with a string of handsome co-stars like Marlon Brando and Rex Harrison.